<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            /* background-color: transparent; */
            /* transparent 透明度 清澈的 这是默认的颜色 */
            background-image: url('../images/repeatPractice.png');
            /* repeat no-repeat repeat-x repeat-y */
            /* background-repeat: repeat; */
            /* 默认 repeat  x和y都平铺 */
            /* background-repeat: no-repeat; */
            /* 不平铺 */
            /* background-repeat: repeat-x; */
            background-repeat: repeat-y;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>